TW200938434A - Device for reducing the drive power requirement of a ship - Google Patents

Abstract

A device (100) for reducing the drive power requirement of a ship and even for not very quick ships of all types, in particular for slow, full-built ships such as tankers, bulkers and tugboats, and for improving the propeller blower stream as well as for producing a pretwist consists in a front nozzle (20) fixedly installed on the hull (100) with fins or hydrofoils (30a, 30b, 30c, 30d) placed in the inner space (20a) thereof.

Description

200938434 IX. INSTRUCTIONS: TECHNICAL FIELD OF THE INVENTION The present invention relates to an apparatus for reducing the driving power requirements of a single or multiple propeller vessel. [Prior Art] The object of the present invention is to create a device for reducing the driving power demand of a ship. A cost-effective purpose can be achieved by a device having the features of item 1 of the scope of the patent application. SUMMARY OF THE INVENTION The apparatus for reducing the driving power demand of a single or multiple propeller vessel according to the present invention is configured such that the apparatus fixedly mounted on the hull and in front of the propeller includes a front a nozzle, and a plurality of fins or hydrofoils disposed within the front nozzle. With the device thus configured, it is possible to reduce the driving power demand of a ship. The possible benefits will increase as the propeller thrust load factor increases. The ® unit is particularly suitable for small tankers such as tankers, bulk carriers, and tow vessels, and even all types of non-very fast vessels. The device itself is fixedly mounted on the hull in front of the vessel's propeller and includes two functional elements 'front nozzles' and fins or hydrofoils. Since the front nozzle operates on the principle of a blower flow in an area having a very high flow in the same direction, the propeller speed will increase, and in the low co-current flow region, and placed in the front nozzle to create a pre-twist The speed of the propeller in the fins or hydrofoil® domains will be reduced by the speed of the propellers. Therefore, the two functional components 0 -5 - 200938434 for different sources of loss - that is, the reduction of the effective thrust load of the front nozzle - and The fin or hydrofoil system is responsible for the reduction in torsional losses in the propeller jet. The efficiency of the propulsion system based on the two effects will increase. Further preferred configurations are the subject of the patent application scope. The front nozzle can be positioned to rotate symmetrically with respect to the upwardly biased axis above the propeller, whereby the inner diameter of the front nozzle is up to 90% of the diameter of the propeller. Preferably, four fins or hydrofoil are asymmetrically placed in the front nozzle and radially disposed radially relative to the propeller shaft, whereby the fins or hydrofoils can be coupled to the hull And the front nozzle, and disposed at the rear end of the front nozzle, whereby the fin-shaped or hydrofoil-shaped arched side wall of the hydrofoil type and the lenticular profile profile is attached to the upward impact side of the propeller Turn up and turn down on the impact side of the propeller. In particular, since a smaller or larger number of fins or hydrofoils can be provided, the arrangement of the four fin fins in the inner space of the front nozzle will not constitute any limitation. [Embodiment] ® According to Fig. 1, a device 10 for reducing the driving power demand of a ship consists in that the nozzle 20 is attached to the vessel 100 propeller before having a cylindrical configuration or a different configuration or profile shape (pattern) The front side is not depicted, wherein the nozzle is fixedly mounted on the hull. A plurality of fins or fins 30 are placed in the inner space 20a of the front nozzle 20. The front nozzle 20 is placed on the hull to have a symmetrical rotation associated with one of the upwardly biased axes 21. For the specific embodiment depicted in FIG. 2, the four fins or hydrofoils 30a, 30b, 30c, 30d are star-shaped with different fins or hydrofoil lengths, -6-200938434 is placed in the front nozzle 20 In the internal space 20a. The four fins or hydrofoils are radially asymmetrically disposed within the front nozzle and radially relative to the propeller shaft PA. Since the fins or hydrofoils 30a, 30b, 30c, 30d are connected to the front nozzle 20 and the hull 100 and are placed at the rear end of the nozzle 20 before being turned to the propeller, the fins or hydrofoils 30, 30a, 30b The arched side wall 32 of the hydrofoil or lenticular profile 31 of 30c, 30d will be turned on the port side of the vessel, or on the upward impact side of the propeller, and on the starboard side of the vessel, or the propeller Turn down on the impact side down. In addition, fins or hydrofoils 30a, 3〇b, 30c, 30d

刖 The end is turned on the port side and the front end is turned down on the side of the port (Fig. i and Fig. 3). The direction of rotation of the propeller is in the direction of the arrow X (1st driving: > the fin or hydrofoil 30, or 30 a, 30b, 3 0 c, 3 placed in the inner space 20 a of the front nozzle 20 The angular position of 0 d is adjustable and can be locked into the set angular position. According to a propeller rotating upwards to the starboard side - a specific embodiment, fin or hydrofoil 30a, 30b' 30c , 30 d can present the following preferred radial angular position and initial angular position: Fin angle Angle port (BB) Lower fin (30a) 247.5 0 14. Port (BB) Intermediate fin (30b) 292.5 0 12 Port side (BB) Upper fin (30c) 337.5 0 8. Starboard (SB) Fin (30d) 90.0. 10 ie > For a fin angle definition: Viewed from the rear: 12 o'clock direction = 0' 5, Increasing in a clockwise direction, wherein the fin angle and the angle of attack may be different from the above-described numbers. According to the specific embodiments depicted in FIGS. 1 , 3 , and 6 , the fins or hydrofoils have lenticular shapes. Profile profile 31, attached There is an arched side 200938434 wall 32 and a straight base surface 33. For example, the arrangement and position of the two fins 30 to the propeller shaft pa is such that the upper fin is nearly parallel to the propeller shaft PA with its base surface 33, and below The fins are in a position such that the base surface 33 is at least 5°, preferably 1 相对, relative to the propeller shaft PA. Angles: Other fin angle positions are also possible. In general, the fins 30a 3b, 30c, 30d preferably have the position shown in Fig. 2. Prior to Figures 1 and 6, the nozzle 20 is formed by a profile 25 having a profile profile 26, the profile being attached The outer wall section 26a is inclined at an angle ' with respect to the ® propeller shaft PA and is provided with a built-in straight wall section 26b parallel to the propeller shaft PA'. The wall section has an arc in a region that is rotated away from the propeller. The wall section 26c' and the section will be converted into the outer wall section 26a. The outer wall section 26a may also be arranged in an arc shape. In Fig. 6, the propeller side is indicated by ps. The device of the invention is characterized by the features indicated in the scope of the patent application and the configurations depicted in Figures 1 to 6 of the drawings. BRIEF DESCRIPTION OF THE DRAWINGS A specific embodiment of a device according to the present invention for use on a vessel having an upward starboard rotary propeller is depicted with reference to the accompanying drawings. A starboard side view of the apparatus includes a front nozzle in which a plurality of fins or hydrofoils are disposed. Figure 2 shows a rear view of the device whereby the fins or hydrofoils are unadjusted. Figure 3 shows an enlarged section across the contour of a fin or hydrofoil -8- 200938434 Figure 4 shows a side view of the stern outline. Figure 5 is a cross-sectional view of the hull in the second half. Fig. 6 is a view showing a nozzle according to Fig. 1 and a plurality of fins or hydrofoils placed in the inner space thereof, wherein the position of the fins is shown. [Main component symbol description]

10 unit 20 front nozzle 20a inner space 21 front nozzle shaft upward biased shaft 25 body 26 profile 26a wall section 26b wall section 2 6c wall section 30 fin/hydrofoil 30a fin/hydrofoil 30b fin Plate / Hydrofoil 30c Fin / Hydrofoil 30d Fin / Hydrofoil 3 1 Profile Profile 32 Arched Side Wall 33 Base Surface - 9 - 200938434 100 Ship Hull 左 Port SB Starboard PA Propeller Shaft PS Propeller Side X Propeller Direction of rotation a corner

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Claims (1)

200938434 X. Patent application scope: 1. A device for reducing the driving power demand of a single or multi-propeller ship, characterized in that the device is fixedly mounted on a hull (100) in front of the propeller ( 10) comprising a front nozzle (20), and a plurality of panels or hydrofoils (30; 30a, 30b, 30c, 30d) disposed within the front nozzle. 2. The device of claim 1, wherein the front nozzle (20) having an inner diameter of less than 90% of the diameter of the propeller is symmetrically disposed to correlate with the preferred position on the propeller shaft (PA) The upward biasing axis (21) rotates upward. 3. A device according to claim 1 or 2, characterized in that preferably the four fins or hydrofoils (30; 30a, 30b, 30c, 30d) are placed asymmetrically The inner space (20a) of the front nozzle (20) is radially disposed with respect to the propeller shaft (PA), whereby the fins or hydrofoils can connect the hull with the front a nozzle (20) placed at the rear end of the front nozzle (20), whereby the fins of the fins or hydrofoils (30; 30a, 30b, 30c, 30d) have a lenticular profile (31) The shaped side wall (32) is turned upward on the upward impact side of the propeller and turned v downward on the downward impact side of the propeller. 4. Apparatus according to any one of claims 1 to 3, characterized in that the fins or hydrofoils (30; 30a, 30b '30c, 30d) exhibit the following preferred radial angles Position and initial angular position: Fin angle Angle port (BB) Lower fin (30a) 247.5 14° Port (BB) Intermediate fin (30b) 292.5° 12. Port side (BB) upper fin (30c) 337.5. 8〇 Starboard (SB) Fin (30d) 90.0° 10. . The apparatus according to any one of claims 1 to 4, characterized in that the fins or hydrofoils are placed in the inner space (20a) of the front nozzle (20) ( 30), its angular position can be changed or adjustable. 6. Use of a device (10) having the features of items 1 to 5 of the scope of the patent application for the reduction of slow, large vessels such as tankers, bulk carriers, and towboats, and even all types of non-extremely fast The driving power requirements of the vessel's vessel are used to improve the propeller blower flow and to produce pre-twisters. ❹ ❹ -12-